Jupiter's moon Ganymede, is larger than the planet Mercury!
149
41% of the moon is not visible from earth at any time.
103
Astronomer Percival Lowell believed that he was the first person to observe canals on Venus, but because of a faulty adjustment of the eyepiece on his telescope, he was in fact looking at the blood vessels in his own eye.
4
In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
175
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
If aliens located 60-65 million light years away from us, looked at earth through a really powerful telescope today, they would see dinosaurs!
18
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194